If you need to filter messages from a paticular sender or all messages that have certain words in the subject etc. then a better way to filter such messages would be use one of the messages that match your required criteria.

Conclusion :

The trick explained above is a very useful trick and it would help you a lot in emergency situations when you are searching for one particular mail like a needle in the haystack. Just go through the steps given above and try for yourself to learn this super useful Gmail trick. You might also want to set up auto forwarding in Gmail to improve your workstyle with Gmail.